home_page.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_fcm_web_example/notification_encapsulation.dart';
import 'package:flutter_fcm_web_example/notification_model.dart';

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _isLoading = true;
  StreamSubscription<NotificationModel> _streamSubscription;
  String _token = '';

  final _notifInstance = NotificationEncapsulation.instance;

  @override
  void initState() {
    super.initState();
    _notifInstance.isReady.then((isReady) async {
      if (isReady) {
        _token = await _notifInstance.getToken();
        print(_token);
        _streamSubscription = _notifInstance.stream.listen((event) {
          if (event == null) return;
          showDialog(
            context: context,
            builder: (_) => AlertDialog(
              title: Text(event.title),
              content: Text(event.body),
            ),
          );
        });
      }
      setState(() => _isLoading = false);
    });
  }

  @override
  void dispose() {
    _streamSubscription?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Container(
        alignment: Alignment.center,
        padding: EdgeInsets.all(16),
        child: _isLoading
            ? CircularProgressIndicator()
            : Text(
                'FCM token: $_token',
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 20),
              ),
      ),
    );
  }
}